Oceans are the most mysterious places on earth. Their depths remain largely unexplored, yet ninety-five percent of the planet's habitable space lies within them. And now the life they support is in the balance.
Callum Roberts uses his lifetime's experience working with the oceans to take us on a panoramic tour beneath the seas, exploring the richness of life in the deep and how it has altered over the centuries. From an astonishing increase in jellyfish to an island of plastic in the Pacific the size of a small country, he shows the effect of man upon the oceans, but also how we can restore them to life.